Method for Controlling Rounding Modes in Single Instruction Multiple Data (SIMD) Floating-Point Units

A computer readable medium having a computer program product for controlling an operation mode in a single instruction multiple data (SIMD) unit, said computer readable medium comprising:

• computer program code for providing a first floating-point unit slice and a second floating-point unit slice in a SIMD unit;
• computer program code for controlling said first and second floating-point unit slices by a floating-point status- and control register having a first rounding mode bit field and a second rounding mode bit field;
• and
• computer program code for performing a round-up operation on said first floating-point unit slice according to a bit in said first rounding mode bit field in concurrence with performing a round-down operation on said second floating-point unit slice according to a bit in said second rounding mode bit field.